The transformation of Putnam Avenue in Clinton Hill shows no signs of slowing. In the past couple of years, the arrival of the Fulton Grand bar, the Food Co-op, a handful of new residential buildings and, most recently, Cinnamon Girl bakery have made the stretch between Grand and Irving far more than just one of Brooklyn’s most active drug corridors. The latest opportunity comes in the form of a development site for sale at 28 Putnam Avenue at the southwest corner of Downing Street. TerraCRG has just listed the corner property–which includes both a rundown carriage house as well as a one-story garage — for $1,850,000. Though the footprint is just 2,374 square feet, the FAR in this location is 4.0, meaning a developer can put up about 9,500 square feet of housing.